The origins of the civil war in the south date back to the 1950s. On August 18, 1955, the Equatoria Corps, a military unit composed of southerners, mutinied at Torit. Rather than surrender to Sudanese government authorities, many mutineers disappeared into hiding with their weapons, marking the beginniÍÍÍÍng of the first war in southern Sudan. By the late 1960s, the war had resulted in the deaths of about 500,000 people. Several hundred thousand more southerners hid in the forests or escaped to refugee camps in neighboring countries.

By 1969 the rebels had developed foreign contacts to obtain weapons and supplies. Israel, for example, trained Anya Nya recruits and shipped weapons via Ethiopia and Uganda to the rebels. Anya Nya also purchased arms from Congolese rebels and international arms dealers with monies collected in the south and from among southern Sudanese exile communities in the Middle East, Western Europe, and North America. The rebels also captured arms, equipment, and supplies from government troops.

Militarily, Anya Nya controlled much of the southern countryside while government forces occupied the region's major towns. The guerrillas operated at will from remote camps. However, rebel units were too small and scattered to be highly effective in any single area. Estimates of Anya Nya personnel strength ranged from 5,000 to 10,000.

Government operations against the rebels declined after the 1969 coup. However, when negotiations failed to result in a settlement, Khartoum increased troop strength in the south to about 12,000 in 1969, and intensified military activity throughout the region. Although the Soviet Union had concluded a US$100 million to US$150 million arms agreement with Sudan in August 1968, which included T-55 tanks, armored personnel carriers, and aircraft, the nation failed to deliver any equipment to Khartoum by May 1969. During this period, Sudan obtained some Soviet-manufactured weapons from Egypt, most of which went to the Sudanese air force. By the end of 1969, however, the Soviet Union had shipped unknown quantities of 85mm antiaircraft guns, sixteen MiG-21s, and five Antonov-24 transport aircraft. Over the next two years, the Soviet Union delivered an impressive array of equipment to Sudan, including T-54, T-55, T56 , and T-59 tanks and BTR-40 and BTR-152 light armored vehicles (see Foreign Military Assistance , ch. 5).

In 1971 Joseph Lagu, who had become the leader of southern forces opposed to Khartoum, proclaimed the creation of the Southern Sudan Liberation Movement (SSLM). Anya Nya leaders united behind him, and nearly all exiled southern politicians supported the SSLM. Although the SSLM created a governing infrastructure throughout many areas of southern Sudan, real power remained with Anya Nya, with Lagu at its head.

Despite his political problems, Nimeiri remained committed to ending the southern insurgency. He believed he could stop the fighting and stabilize the region by granting regional selfgovernment and undertaking economic development in the sou bafth. By O October 1971, Khartoum had established contact with the SSLM. After considerable consultation, a conference between SSLM and Sudanese government delegations convened at Addis Ababa, Ethiopia, in February 1972. Initially, the two sides were far apart, the southerners demanding a federal state with a separate southern government and an army that would come under the federal president's command only in response to an external threat to Sudan. Eventually, however, the two sides, with the help of Ethiopia's Emperor Haile Selassie, reached an agreement.

The Addis Ababa accords guaranteed autonomy for a southern region--composed of the three provinces of Equatoria (present-day Al Istiwai), Bahr al Ghazal, and Upper Nile (present-day Aali an Nil)--under a regional president appointed by the national president on the recommendation of an elected Southern Regional Assembly. The High Executive Council or cabinet named by the regional president would be responsible for all aspects of government in the region except such areas as defense, foreign affairs, currency and finance, economic and social planning, and interregional concerns, authority over which would be retained by the national government in which southerners would be represented. Southerners, including qualified Anya Nya veterans, would be incorporated into a 12,000-man southern command of the Sudanese army under equal numbers of northern and southern officers. The accords also recognized Arabic as Sudan's official language, and English as the south's principal language, which would be used in administration and would be taught in the schools.

Although many SSLM leaders opposed the settlement, Lagu approved its terms and both sides agreed to a cease-fire. The national government issued a decree legalizing the agreement and creating an international armistice commission to ensure the well-being of returning southern refugees. Khartoum also announced an amnesty, retroactive to 1955. The two sides signed the Addis Ababa accords on March 27, 1972, which was thereafter celebrated as National Unity Day.

Data as of June 1991